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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8365d2d845ca0dbfbc7d1cf945b0326b74893de111177c374c4c1fbf5de7028' 
  AND token = 'rwjUGh62bwDhh55aklVScaww0J++5V4U6LBhYTX4IQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}